change column name sql

--The following example renames the column TerritoryID in the table Sales.SalesTerritory to TerrID in the AdventureWorks database.

EXEC sp_rename 'Sales.SalesTerritory.TerritoryID', 'TerrID', 'COLUMN';

ALTER TABLE table_name RENAME COLUMN old_name TO new_name;

ALTER TABLE table_name 
ALTER COLUMN column_name new_data_type(size);

ALTER TABLE dbo.doc_exa 
ADD column_b VARCHAR(20) NULL, 
	column_c INT NULL ;

EXEC SP_RENAME 'TABLE_NAME.OLD_COLUMN_NAME','NEW_COLUMN_NAME'

ALTER TABLE table_name RENAME COLUMN old_name TO new_name;

ALTER TABLE nom_table
RENAME COLUMN colonne_ancien_nom TO colonne_nouveau_nom

ALTER TABLE `Table Name` MODIFY COLUMN `Column Name` Datatype(Size);

ALTER TABLE users
 ALTER COLUMN first username varchar(20);

ALTER TABLE `db_name`.`table_name` 
	CHANGE `current_column_name` `new_column_name` datatype(size) NOT NULL COMMENT '';